Boiler and furnace grate



W. M. KINGSBURY AND M. L. FOOTE. BOILER AND FURNACE GRATE.

APPLICATION FILED FEB. 12. ms.

1,316,725. Patented Sept. 23, 1919.

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W. M. KINGSBURY AND M. L. FOOTE. BOILER AND FURNACE GRATE.

APPLICATION FILED FEB. I2, 1918. 1,316,725. PatentedSept. 23, 1919.

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WILLIAM M. KINGSBURY AND MOSES L. room, or CLEVELAND, oHIo.

BOILER AND FURNACE Specification of Letters Patent.

Patented Sept. 23, 1919.

To alt whom it may concern:

Be it known that we, WILLIAM M. K1Nes- BURY and Moses L. Foo'rn,citizens of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and usefulImprovements in Boiler and Furnace Grates, of which the following is aspecification.

This invention relates to furnace grates for boilers or water heaters,and particularly to hollow grates through which water or other fluid maycirculate, and it is especially useful in down draft furnaces.

An object of the invention is to construct a grate of this type of aplurality of units so connected that any one or more thereof may beremoved or blanked off without pre- Venting the use of the remainder.

A further object is to combine such a grate with a header to distributethe circulation of the fluid through the units. f

A further feature of the invention is that the grate has no jointsexposed to the action of the fire.

A further object is to so shape the grate sections as to accommodate theexpansion thereof in proportion to the heat developed.

A further object of the invention is to so shape the units as to giveclearance for the fuel; that is the bottom spaces between the units arewider than the top spaces.

The invention also provides convenient means for making the propercirculating connections with the grate units, for the circulatingmedium.

With these and other objects in View, one embodiment of the invention isillustrated inthe accompanying drawings in which Figure 1 is a verticalsectional view of the grate and part of the boiler;

Fig. 2 is a front elevation;

Fig. 3 is a sectional plan;

Fig. 4 is a detail in longitudinal section of one of the units;

Fig. 5 is a section on the line 5-5 of Fig. 4;

Fig. 6 is a front elev'atlon of the header;

Fig. 7 is an end view thereof;

Fig. 8 is a section on the llne 88 of Fig. 6;

Fig. 9 is a cross sectlon of two of the units, showing clearancetherebetween.

The boiler may be of any suitable construction. As shown it comprises aplurality of sections A, with a fire box B and ash pit C, a section D atthe rear of the fire box being extended downwardly to divide the firebox from the rear part of the boiler, said section having an opening Eat the back of the ash pit, whereby the draft is downward through thegrate and thence rearwardly through the boiler sections.

The grate proper consists of a plurality of units or bars standingedgewise beside each other as shown in Fig. 3. The front ends of thesebars are supported at the boiler front, and the rear ends rest upon theledge 13 extending across the partition section D. Each unit has anupper passage 6 and a lower passage 7, separated by the verticallytapering partition 5, the passages 7 and 6 communicating through areturn bend at the inner end of the bar, the former be-' ing the inletpassage and the latter the outlet passage, so that the flow is rearwardthrough the passage 7 and forward through the passage 6. These bars orunits when assembled to form the grate are spaced apart by side flanges30 at the front, and projections 17 at the rear, where they rest on theledge 13. This ledge projects from a water-cooled bridge-wall section ofthe boiler and the ends of the bars are spaced from the wall of thesection, to allow for expansion rearwardly on the ledge. As shown inFig. 9 the units are tapered downwardly so that the space 24 at the topis narrower than the space 25 at the bottom, thereby giving clearancedownwardly for the consumed fuel.

The respective units are connected at the front of the furnace to asingle header extending across the front thereof. This header isindicated at 12 and has a lower or inlet passage 8 and an upper oroutlet passage 4: separated by a partition 30, and

- the header is connected to the respective passages 6 and 7 by means oftaper nipples or thimbles 3, which fit in the ends of said passages andin taper seats 28 in the inner wall of the header 12, the units andheader being drawn or held together by bolts 2 at the top and bottomedges of the header engaging the notched flanges 31 at the top andbottom of the units.

The inlet passage 8 in the header is connected by pipes 11, at oppositeends to the lower side drums 50 of the boiler, and the upper headerpassage 4 is connected at its ends by the pipes 9 to one or more of theboiler sections, one such connection being shown at 15. This provides acirculation between the boiler and grate. v

By means of the construction shown the units composing the grate can bereadily inserted side by side and bolted to the header, and if desiredanyone of them can be removed by taking out the appropriate bolts,slipplng the unit rearwardly until it clears the nipples 3, and liftingthe unit clear of the header and out through the front opening or doorof the furnace, without disturbing the other units or taking down theheader, and the space may then be blanked off. In any event repairs canbe quickly made. The tapered form of the grate units is such as to mosteffectively accommodate the relative expansion, and the inclination ofthe passages 6 and 7 assists flow through the units and preventstrapping of steam therein. The units are without joints, except thesingle connection with the header outside of the furnace, which is adecided advantage in furnaces of this type.

We claim:

The combination with a firebox having an opening in the face platethereof, of hollow grate bars having openings at the outer ends thereof,a transverse header extending across the outer ends of the bars andcommunicating with the openings therein, said bars having one set offlanges fastened to the header and also having another set of flangeswhich fit within the opening in the front wall of the firebox and spacesaid bars apart.

In testimony whereof, we do affix our signatures in presence of twowitnesses.

WILLIAM M. KINGSBURY. MOSES L. FOOTE.

lVitnesses R. G. CARPENTER, B. U. RANNELLS;

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

